With my rev2 FPGA0 runs fine and loads the bitstream with MPBM, but when it comes to detect FPGA1 it says "Bus 1 .... more than 99 devices on JTAG chain" ..

Sounds like something isn't right on the board. I would get in touch with Fizzisist and let him know; he's pretty awesome with support. BTW just a note; I would mine on a pool with stratum support. Works pretty good with X6500.

I would give him a bit more time to get back to you. But in the meanwhile, I would identify the problematic FPGA and remove the stock heat sink. Check the chip to see if there are any bubble / deformities and if it is clear of them, clean the chip off with a small amount of rubbing alcohol. You can at this point replace the thermal tape on the heat sink (just make sure you clean the base of the heat sink thoroughly).

If the chip has bubbles / is warped / cracked, then you are likely out of luck. Best of luck to you and I hope its just some bad thermal tape.

Unfortunately, demand for FPGA miners has been too low in recent months to justify continuing to produce new X6500s. For the foreseeable future, FPGA Mining will be suspending operations. It's sad to step away from such an exciting and interesting project, but the time has come.

Thank you all for your interest and support! We'll still be involved in the Bitcoin world and hopefully find a new project to participate in soon!

The non working FPGA is getting warm, yes, the working one is really hot like it used to be, but the non functioning one is just getting hand warm.

It's not loose though..

It still has the error "More than 99 JTAG devices on chain... " wtf ?!

I had no reply from fizzisist for few days.. messaged him privately..

Hi ocminer,

Sorry for the delay in getting back to you. It's not clear what's going on with your FPGA to cause this. "More than 99 devices..." sounds like the TDO line is stuck high, so the computer is reading in 11111111... when detecting the number of devices in the JTAG chain. The first thing you need to check is whether power is present. If you have access to a voltage meter, you can probe the sides of the large electrolytic capacitors to check that the supply voltages for the FPGAs are being produced. It sounds like FPGA0 is working fine, so you should probe C58. This should read 1.2V (VCCINT for FPGA1). After checking that, we can think about other possibilities.

Unfortunately, demand for FPGA miners has been too low in recent months to justify continuing to produce new X6500s. For the foreseeable future, FPGA Mining will be suspending operations. It's sad to step away from such an exciting and interesting project, but the time has come.

Thank you all for your interest and support! We'll still be involved in the Bitcoin world and hopefully find a new project to participate in soon!

Unfortunately, demand for FPGA miners has been too low in recent months to justify continuing to produce new X6500s. For the foreseeable future, FPGA Mining will be suspending operations. It's sad to step away from such an exciting and interesting project, but the time has come.

Thank you all for your interest and support! We'll still be involved in the Bitcoin world and hopefully find a new project to participate in soon!

Best regards,fizzisist, fpgaminer, TheSeven, li_gangyiFPGA Mining LLC

@Fizzisist:

Thank you for doing all that you have done for Bitcoin thus far and I look forward to your future projects!

Unfortunately, demand for FPGA miners has been too low in recent months to justify continuing to produce new X6500s. For the foreseeable future, FPGA Mining will be suspending operations. It's sad to step away from such an exciting and interesting project, but the time has come.

Thank you all for your interest and support! We'll still be involved in the Bitcoin world and hopefully find a new project to participate in soon!

Best regards,fizzisist, fpgaminer, TheSeven, li_gangyiFPGA Mining LLC

It is a pleasure to use your miner. It has already more than paid for itself!

I've got quite a few...199USD in via PayPal shipped within continental USA only. (The used chips are worth approx 75 each, so my price is firm). If you have a home serving running....plug a few of these in to make a few bucks on the side. They use very little power.